undef

s1a-ew-grd-vv-20160829t214326-20160829t214342-012821-01438b-001_filter

s1a-ew-grd-vh-20160829t214326-20160829t214342-012821-01438b-002_filter

s1a-ew-grd-vv-20160829t214326-20160829t214342-012821-01438b-001_winddir

s1a-ew-grd-vh-20160829t214326-20160829t214342-012821-01438b-002_winddir